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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2013
EARNINGS PER SHARE [Abstract]  
Computation of Basic and Diluted Earning Per Share

The following table sets forth the computation of basic and diluted earnings per share of common stock as follows:

 
 
Three Months Ended
 September 30, 
 
Nine Months Ended
 September 30, 
 
 
2013 
 
2012 
 
2013 
 
2012 
 
 
(in thousands, except share and per share data)
 
Numerator for common earnings per share:
 
  
  
  
 
Net income
 
$
16,437
  
$
14,065
  
$
43,235
  
$
39,485
 
Net income allocated to participating securities
  
—
   
—
   
—
   
(3,259
)
Numerator for basic earnings per share
  
16,437
   
14,065
   
43,235
   
36,226
 
Effect on income available from reallocation of options
  
—
   
—
   
—
   
263
 
Numerator for diluted earnings per share
 
$
16,437
  
$
14,065
  
$
43,235
  
$
36,489
 
 
                
Denominator for basic earnings per share:
                
Weighted average common shares outstanding
  
46,162
   
42,952
   
45,492
   
38,990
 
Effect of dilutive securities:
                
Stock options
  
2,558
   
3,549
   
2,628
   
3,739
 
Denominator for diluted earnings per share
  
48,720
   
46,501
   
48,120
   
42,729
 
 
                
Net income per share:
                
Basic
 
$
0.36
  
$
0.33
  
$
0.95
  
$
0.93
 
Diluted
 
$
0.34
  
$
0.30
  
$
0.90
  
$
0.85
 
Anti-dilutive options not included in the calculation
  
1,873
   
1,953
   
1,399
   
1,582